What are the apologetic machines for?
Without the DLC, that is the extent of the use of these machines. They served no purpose until the release of the 3C3C1D119440927 DLC.
If you have that DLC pack installed, then these machines are replaced by machines that invite you to participate in their arenas. The quest for the DLC will add markers to your map to help you find these locations again, so don't worry about keeping track of where you saw them.